nvidia-stable: apply 3.18 compat patch too.

srcpkgs/nvidia-stable/template

@@ -4,7 +4,7 @@ _desc="NVIDIA drivers for linux (long-lived series)"
 
 pkgname=nvidia-stable
 version=340.65
-revision=2
+revision=3
 maintainer="Juan RP <xtraeme@gmail.com>"
 license="Propietary NVIDIA license"
 homepage="http://www.nvidia.com"
@@ -37,6 +37,10 @@ do_extract() {
 	./${_pkg}.run --extract-only
 	rm -f ${_pkg}.run
 }
+do_configure() {
+        cd ${_pkg}
+        patch -sNp0 -i ${XBPS_SRCPKGDIR}/nvidia/files/linux-3.18-drm.patch
+}
 do_install() {
 	cd ${_pkg}